* {
  padding: none;
  border: none;
  box-sizing: border-box;
}
ul {
  list-style: none;
}
#canvas {
  margin: 0;
  padding: 0;
  vertical-align: top;
  position: fixed;
  top: 0;
  left: 0;
}
.icon {
  width: 2.5em;
  height: 2.5em;
  vertical-align: -0.15em;
  fill: currentColor;
  overflow: hidden;
}
.operator {
  position: fixed;
  flex-wrap: wrap;
  width: 100%;
  top: 30px;
  left: 0;
  display: flex;
  justify-content: center;
  text-align: center;
}
button {
  height: 5em;
  width: 5em;
  border-radius: 50%;
  margin-right: 1.5em;
  margin-top: 1.5em;
}
button.active {
  box-shadow: 0 0 15px #23eed8;
}
ul {
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: absolute;
  bottom: 30%;
}
li {
  height: 1.5em;
  width: 1.5em;
  border-radius: 50%;
  margin-top: 0.5em;
  margin-right: 0.5em;
}

li > .icon {
  height: 1.5em;
  width: 1.5em;
}
li.active {
  transition: 0.5s;
  transform: scale(1.3);
  box-shadow: 0 0 15px #23eed8;
}
@media screen and (max-width: 400px) {
  ul {
    display: flex;
    flex-flow: row wrap;
    left: -5%;
    top: auto;
    bottom: 40px;
    width: 100%;
    justify-content: center;
    text-align: center;
    transform: translate(0, 0);
    margin: 0 auto;
  }
}
